Our company, cooperating with famous colleges and universities in
China, developed masonry glue specific for the stack anti-corrosive
construction after thorough and detailed tracking and understanding
of the stack desulfurization anti-corrosive projects. The product
is divided into A component and B component. It mainly uses organic
silicon as the main material and has excellent properties of
weather resistance, high temperature resistance, acid resistance
and fire resistance, which completely meet the technical
requirements for the stack anti-corrosion of fire plants and are
used widely.

Through years of operation and due to the severe operating
environment in the stack and factors occurred during the
construction process, acid liquid on the inner wall of the stack
will infiltrate and corrode the outer wall of the stack along the
cracks, which will cause serious danger to the safe operation of
the stack. To solve the problem, we also developed a special
anti-corrosive rubber and an anti-corrosive bottom coating for the
stack. The product is single component and uses modified organic
silicon as the main material. It is treated in a special way and
added with fillers of excellent acid resistance. Advanced
manufacturing technology is adopted to process the product. The
bottom coating should be sprayed to the concrete stack inner wall
by professional spraying equipment and cure in room temperature.
The stack anti-corrosion rubber can be applied directly to the
stack wall surface and floated. The cured rubber coating has
extremely excellent properties of weather resistance, acid
resistance, and leakproofness, which prevents the stack inner wall
completely from the glue gas and enhances the service life of the
stacks.

2, Construction performance

a. Stack anti-corrosion masonry glue: Good thixotropy, easy to
apply; the glue does not run during facade construction; in the
process of testing, mixing uniformity of the A, B components can be
observed through color change, thus it’s easy to handle the
construction. It’s easy to feed B component and simple to operate
at site. The ratio of A, B components can be changed conveniently
according to different conditions of the seasons and construction
sites. Construction time after the glue is mixed should be
controlled to meet the requirements of construction and curing
time.

b. Stack anti-corrosion rubber: moderate viscosity, difficult to
flow, easy to apply and convenient to use. The rubber cures into
elastomer at room temperature by absorbing only a little moisture
in the air, needing no additive conditions.

Organic silicon possesses acid resistance and the ability of dilute
alkali solution. Usually, adding fillers with excellent acid
resistance property and silane coupling agent to the organic
silicone rubber can improve the acid resistance of it to some
extent. Our company adopted special treatment of the fillers to
bond the organic silicon and the fillers together tightly so that
the acid resistance of the stack rubber is increased furtherly.

b, Remarkable heat resistance

During the flue gas emission of stacks in power plants, the
temperature of the flue gas changes between 40℃ and 150℃ as working
conditions change. The temperature will exceed 180℃ or even higher
under accident circumstances. Thus the stack anti-corrosion rubber
is required to be excellent in heat resistance. The organic
silicone rubber has a good thermal oxidation stability because the
backbone of it consists of silicon-oxygen bond. The mechanical
properties of it do not change much at below 150℃ and it can be
used for more than 1000h at above 200℃. The stack rubber of our
company is better in heat resistance due to the addition of
heat-resistant additive. It can meet the requirement of working
temperature in the stack as anti-corrosive material.

c, Excellent weather resistance

The backbone of the organic silicon does not contain unsaturated
bond and the silicon-oxygen bond is stable to oxygen, ozone and UV
rays. As a result, the organic rubber does not crack, degrade or
grow tacky after long-term exposure to UV rays or wind or rain
through outdoor solarization and accelerated aging test.

4, Performance indexes of KDW--982 foam brick adhesive (masonry
glue)

Item

Before use

After use

Test method or experimental conditions

A

B

Before curing

Appearance &color

white/gray paste

black

paste

Black

paste

visual inspection

Density (g/cm3)

1.3～1.5

1.08

1.3～1.5

GB/T13477.2

Operating time (h)

1～2

----

Curing time (25℃,h)

24～48

----

After

cured

Tensile strength (MPa)

After

≥2.0

GBT/528 Dumbbell Ⅰtype

500mm/min

Elongation (%) Cure

≥100

500mm/min

GBT/528 Dumbbell Ⅰtype

Shore hardness (A)

40～60

500mm/min

Shear strength( MPa )

≥1.5

GBT/531

GBT/528 500mm/min

(steel plate--steel plate)

50℃, 5% sulfuric acid

Soaking 7d(%)

No obvious change of the appearance, tensile strength retention
rate≥80

GBT/528 Dumbbell Ⅰtype

500mm/min

Heat resistance (180℃,24h)≥

No obvious change of the appearance, tensile strength retention
rate≥90

GBT/528 Dumbbell Ⅰtype

500mm/min

Resistance to 80℃2% sulfuric

acid, 0.1% nitric acid,

and 0.1% phosphoric mixed

acid 7d(%)

No obvious change of the appearance, tensile strength retention
rate≥65

GBT/528 Dumbbell Ⅰtype

500mm/min

Bonding strength

(steel plate-steel plate)

≥1.0

GB/T50212

5, Application method

a, Glue distribution

Proportion recommended is A component : B component=10:1. The
operating time is 1 hour when the working temperature is 25℃. B
component dosage can be increased or decreased in a range of 15% to
speed up or slow down the curing speed.

b, Stirring

Use electrical tools or other blenders to stir the glue. The glue
is supposed to be black after mixing uniformly. If there is white
or lightly-colored glue or partly too deep, that means it needs to
be stirred furtherly until it is uniformly colored.

c, Pasting

Coat the stack anti-corrosive glue on the foam glass
brick/lightweight vitrified brick, and make sure the thickness of
the glue layer is no less than 3mm on the paste face between the
brick and the stack inner wall, and the glue layer thickness is no
less than 1mm on the contact face between brick and brick.

Notes:

(1). The product can only be applied when the A and B components
are mixed up uniformly according to appropriate proportion. If the
mixture is not uniform or the proportion is not in the recommended
range, then construction quality will not be guaranteed.

(2). The curing speed is largely affected by construction
temperature. The higher the temperature is, the faster the curing
speed.

Both A and B components should be stored in sealed containers and
the storage temperature should be of or below 28℃. The validity
period is 9 months at the temperature between 23℃ and 25℃ under
sealed state.